Here some VPN List that can use without paying (free Linux VPN)
ProtonVPN: Get free data for life, fast connections, unlimited browsing, and an interface that is very easy to navigate. That’s a reliable service with a high level of security and confidentiality.
Windscribe: Offers a free plan with data allowance of 10GB per month. It is known to provide good security measures and also to help unblock restricted sites.
Read More : https://techyeco.com/free-vpn-for-linux/